Airtac ACQJ32~40 Adjustable Thin-Type Cylinder ACQJ40X125-75B
The AirTAC Airtac ACQJ32~40 Adjustable Thin-Type Cylinder ACQJ40X125-75B is a genuine double-acting COMPACT (JIS) cylinder with an EXTERNAL adjustable stop on the extend stroke — a Ø40mm bore and 125mm full stroke. Turn the stop to fine-tune the end position on the machine without changing parts.
- BoreØ40 mm
- Full stroke125 mm
- Port sizePT1/8
- Adjuster threadM12×1.25
About the Airtac ACQJ32~40 Adjustable Thin-Type Cylinder ACQJ40X125-75B
The AirTAC ACQJ40X125-75B is a double-acting, single-rod JIS compact cylinder featuring a male-thread piston rod end (M14x1.5) that couples directly to your load. As a long-stroke made-to-order variant, its 125mm total stroke exceeds the standard 100mm maximum for this 40mm bore size. It utilizes an external M12x1.25 threaded stop with a lock nut to precisely limit the extend end position, providing a usable extend range of 50-125mm without changing parts. The retract stroke remains completely unaffected.
Because the internal piston area is unchanged, the output force is identical to a standard ACQ of this bore: 628.3N push and 527.8N pull at 0.5 MPa, reaching 879.6N push at 0.7 MPa, with a maximum push of 128 kgf at 1.0 MPa. The body incorporates sensor grooves for tracking position, though this specific configuration ships without a magnet. Deceleration is handled by a fixed NBR elastomer bumper at each end rather than an adjustable air cushion.
Airtac ACQJ32~40 Adjustable Thin-Type Cylinder ACQJ40X125-75B Technical Specifications
| Model | Airtac ACQJ32~40 Adjustable Thin-Type Cylinder ACQJ40X125-75B |
|---|---|
| Series | ACQJ JIS compact adjustable-stroke cylinder |
| Bore size | Ø40 mm |
| Full stroke | 125 mm |
| Adjuster thread | M12×1.25 |
| Port size | PT1/8 |
| Fluid | Air (filtered by 40µm element) |
|---|---|
| Operating pressure | 0.15 – 1.0 MPa |
| Proof pressure | 1.5 MPa |
| Temperature | -20 to +70 °C |
| Speed range | 30 – 500 mm/s |
| Rod thread | M8×1.25 (F) / M14×1.5 (B) |
Specifications follow the official AirTAC ACQJ datasheet. The adjustable stop shortens the EXTEND stroke only; the piston area — and therefore the force — is the same as a standard ACQ of this bore. Adjustable window options: 10/20/30/40/50/75/100 mm.
Theoretical Output Force (Ø40mm)
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 628 N | 528 N |
| 0.7 MPa | 880 N | — |
| Max (@1.0 MPa) | 128 kgf | |
Force equals a standard ACQ of the same bore — the adjuster changes stroke length, not piston area. Actual usable force is lower due to friction; size with a safety margin.
Model Code: Airtac ACQJ32~40 Adjustable Thin-Type Cylinder ACQJ40X125-75B
| ACQJ | JIS compact double-acting ADJUSTABLE-STROKE cylinder series. |
|---|---|
| 40 | Bore size in mm. |
| ×125 | Full stroke length in mm. |
| -0 | Adjustable window in mm (extend stroke can be shortened by up to this). |
| S / B | Magnet (S) / male-thread rod (B); omit for none / female thread. |
Thread: PT standard (G / NPT available). Related: ACQ (fixed stroke), ACQD (double rod), TACQ (guided / non-rotating).
Where the Airtac ACQJ32~40 Adjustable Thin-Type Cylinder ACQJ40X125-75B Is Used
Machining Fixture Clamping
Dial in the exact clamping reach on a CNC fixture during product-changeover. The external stop lets you shift the 50-125mm extend endpoint instantly without machining new spacer rings.
Transfer Line Diverter
Adjust the stroke of a package diverter gate on a conveyor to handle varying carton widths. The male M14x1.5 rod end threads directly onto the gate bracket for secure load coupling.
Assembly Press Tonnage
Set trial end positions for a press station assembling bearings. The fixed NBR bumper absorbs the internal impact at the end of stroke, protecting the tooling while you tune the exact extend depth.
Is the Airtac ACQJ32~40 Adjustable Thin-Type Cylinder ACQJ40X125-75B the Right Cylinder?
When sizing this 40mm bore, stepping down to a 32mm bore yields 402.1N push at 0.5 MPa, while stepping up to a 50mm bore provides 981.8N push. If your extend end position never varies, a fixed-stroke ACQ cylinder is simpler and suffices. To order this adjustable model correctly, confirm the 40mm bore, 125mm full stroke, 75mm window, the male -B rod thread, and note that no -S magnet is included. Since this is a long-stroke variant, verify your space constraints and allow for made-to-order lead times.
Quick checklist
- ✓ Need on-machine end-position tuning?
- ✓ Full stroke and adjust window (mm)
- ✓ Force at your working pressure
- ✓ Magnet (S) for sensors?
- ✓ Female (blank) or male (B) rod thread
Installation & Maintenance Notes
- check Use clean air filtered to 40µm or finer.
- check Keep within 0.15 – 1.0 MPa operating pressure.
- check Lock the adjuster nut after setting the stop.
- check The stop limits the EXTEND stroke only.
- check Avoid side load on the short piston rod.
- check Installation by qualified personnel per AirTAC docs.
Airtac ACQJ32~40 Adjustable Thin-Type Cylinder ACQJ40X125-75B FAQ
The usable extend range is 50-125mm (125mm full stroke minus up to 75mm). Force is identical to a standard ACQ: 628.3N push and 527.8N pull at 0.5 MPa, 879.6N push at 0.7 MPa, and a maximum push of 128 kgf at 1.0 MPa.
No, the M12x1.25 adjuster only changes the extend stroke length, not the piston area, so force remains unchanged. Shock is handled by a fixed NBR elastomer bumper at each end. For high-speed or high-energy loads, add an external shock absorber or slow the approach.
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Related AirTAC ACQJ Compact Cylinders
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